This species was reported from Thailand by Sridith (Thai Forest Bull., Bot. 27: 118. 1999) and as having filaments fused at their middles into a tube, but according to the Chinese specimens studied and descriptions of this species in other regions (e.g., Fl. Bhutan 2(2): 756. 1999) the filaments are free. The Thai distribution is provisionally excluded here pending further study of the delimitation of this species.